# Climate Control Needs Calculator

This calculator allows you to estimate the climate control needs (thermal loads) of a building, both in summer and winter. It also helps estimate the monthly energy consumption over a month.

## Instructions

• Enter the exterior temperature for both periods, based on the temperatures in your location. You can also modify the interior temperatures, although regulations specify 21 degrees in winter and 24 in summer.
• Enter the building’s data: surface area (in m2), height (in m), and occupancy (in people).
• Enter the linear meters of facade for each orientation. By facade, we mean only those walls in contact with the exterior, excluding interior walls (between rooms) or party walls (in contact with other dwellings or premises in the building).
• Enter the linear meters of party walls, considering all walls of your building that border another location, regardless of their orientation.
• The following image shows an example of how to correctly account for facades (with orientation) and party walls (without orientation). Click on the image to enlarge.

• Enter the area of windows based on their orientation. Include other openings like gallery doors, etc. For example, if on the north facade you have 3 windows of 1.5 x 1.2, you would note 3x1.5x1.2 = 5.4 m2 in the north window box. It’s important to note that you need to input the total transmittance of the opening, meaning both glass and frame. The window frame can have a significant transmittance, and sometimes manufacturers only provide the glass value, which is lower. Ask for the transmittance value for the entire opening.
• Choose the type of floor and roof in the drop-down menus based on the type of floor above or below yours.
• Fill in the transmittance values for the various elements that make up the building envelope. Transmittance represents the amount of heat that passes through the enclosure. The worse the insulation quality, the higher the transmittance. If your building already exists, it’s difficult to know the transmittance of the enclosures. You can consult a catalog of construction solutions and search for values for your typology, but you might always have doubts, for example, about the insulation thickness. That’s why I’ve provided a range of typical values for each type of enclosure. The lower values correspond to exceptionally well-insulated dwellings. The worse the construction of your building and the older it is, the closer you’ll get to the higher values of the range (you might even have worse values).

 Temperaturas Verano Invierno Exterior Interior Datos generales Superficie Altura Ocupacion Cerramientos Fachadas Metros lineales Ventana (m2) Norte Sur Este Oeste Medianera
 Type of Floor On groundAbove unheated floorAbove heated floor Type of Roof Under roofUnder unheated floorUnder heated floor
 Transmitancias Fachadas (0.7 - 1.8) Ventanas (2.4 - 6) Suelos (0.6 - 1.6) Cubierta (0.45 - 1.2) Medianiles (1 - 2.2)

# Results

Below is the breakdown of climate control consumption, both for summer and winter, categorized according to the different thermal loads of the building. At the end, the total power and a ratio with the required power per surface area are displayed.

 Resultados Cargas transmision Verano Invierno Norte Sur Este Oeste Ventanas Suelos Cubierta Medianiles Cargas radiacion solar Norte 0 Sur 0 Este 0 Oeste 0 Cargas ventilacion Cargas iluminacion 0 Cargas ocupacion 0 Total perdidas (W) Coeficiente (W/m2)

A typical demand would be around 80-100 W/m2. You can use this value to compare the efficiency of your building.

# Energy Consumption Estimation

Finally, with the power calculated previously, we can estimate the energy consumption (in kWh) over a period of time, for example, a month. To do this, simply fill in the operating hours and the number of days.

The number of operating hours is not the number of hours the heating system is turned on, as the exterior temperature varies throughout the day and doesn't always match the value you entered initially for the exterior temperature. Therefore, this schedule should be an average value that considers the influence of exterior temperature variation based on your location. If you're unsure, leave the default average operating values provided in the table.

 Consumo Horas Días Estimación (kwh)

Now, you can use our heating expense calculator to convert this energy consumption into euros, based on the different available energy sources. You just need to take the consumption value in kWh and input it as electric consumption in the other calculator.